CN104329537A - Submerged arc furnace flue vacuum insulation pipe with compound fireproof pouring material layer - Google Patents

Abstract

A submerged arc furnace flue gas vacuum insulation pipe with a composite refractory castable layer, comprising a steel pipe body, a vacuum cavity and a castable storage cavity are arranged in the pipe wall of the steel pipe body, and the vacuum cavity and the castable storage cavity are arranged The shape corresponds to the shape of the steel pipe main body, and the vacuum cavity and the pouring material storage cavity are coaxial. The castable storage cavity is filled with composite refractory castable after adding water and stirring evenly. The composite refractory castable is made of the following components in parts by weight: 10-15 parts of corundum, 10-15 parts of mullite, and 10-15 parts of silicon carbide , 5-10 parts of silica fume, 15-20 parts of magnesia, 10-15 parts of graphite, 10-15 parts of alumina micropowder, 2-10 parts of phenolic resin, 3-10 parts of carbon nanotubes, the inner tube wall of the steel pipe body A permeation hole is opened on the top, and the permeation hole communicates with the refractory housing cavity, so that the composite refractory castable seeps out from the permeation hole to form a composite refractory castable layer.

Description

Vacuum insulation pipe for flue gas of submerged arc furnace with composite refractory castable layer

technical field

The invention relates to the technical field of pipe insulation, in particular to a vacuum insulation pipe for flue gas of a submerged arc furnace with a composite refractory castable layer.

Background technique

Existing flue gas insulation pipelines of submerged arc furnaces mostly use simple insulation materials for pipeline insulation. Because the insulation materials do not have strength, the pipelines will be sucked flat during long-term operation; at the same time, due to the falling off of insulation materials, the reduction The temperature of the flue gas is lowered, so that the power generation efficiency of the waste heat of the flue gas is significantly reduced.

Contents of the invention

In view of this, it is necessary to provide a submerged arc furnace flue gas vacuum insulation pipe with a composite refractory castable layer that has a good thermal insulation effect and a long service life.

A submerged arc furnace flue gas vacuum insulation pipe with a composite refractory castable layer, comprising a steel pipe body, a vacuum cavity and a castable storage cavity are arranged in the pipe wall of the steel pipe body, and the vacuum cavity and the castable storage cavity are arranged The shape corresponds to the shape of the steel pipe body, the vacuum cavity and the castable storage cavity are coaxial, and the distance from the castable storage cavity to the inner tube wall of the steel tube body is smaller than the distance from the vacuum cavity to the inner tube wall of the steel tube body, The pipe wall of the steel pipe body is provided with a first refractory castable injection hole and a second refractory castable injection hole, the first refractory castable injection hole and the second refractory castable injection hole communicate with the castable housing cavity, and the One end of the pipe wall is provided with an annular embedding groove, and the other end of the pipe wall of the steel pipe body is provided with an annular embedding arm. Corresponding. The castable storage cavity is filled with composite refractory castable after adding water and stirring evenly. The composite refractory castable is made of the following components in parts by weight: 10-15 parts of corundum, 10-15 parts of mullite, and 10-15 parts of silicon carbide , silica fume 5~10 parts, magnesia 15~20 parts, graphite 10~15 parts, alumina micropowder 10~15 parts, phenolic resin 2~10 parts, carbon nanotubes 3~10 parts; magnesia, graphite, corundum , mullite, and silicon carbide are mixed to make granules and fine powders, and alumina micropowder, silica fume, carbon nanotubes, and phenolic resin are used as admixtures, and the parts by weight of granules and fine powders are: 50-55 parts , 45~50 parts of fine powder, the particle size range is 1.2~1.6mm, and the fine powder particle size is 0.4~0.8mm. There are permeable holes on the inner wall of the steel pipe body, and the permeable holes communicate with the castable storage cavity. In this way, the composite refractory castable seeps out from the permeable holes and forms a composite refractory castable layer.

The above-mentioned submerged arc furnace flue gas vacuum insulation pipe with a composite refractory castable layer has a vacuum chamber in the pipe wall of the steel pipe body, the shape of the vacuum chamber corresponds to the shape of the steel pipe body, and the composite refractory castable layer A castable storage cavity is set in the flue gas vacuum insulation pipe of the submerged arc furnace. In the composite refractory castable in the castable storage cavity, magnesia, at high temperature, obtains magnesium oxide, silicon dioxide, calcium oxide, magnesium oxide, and silicon dioxide. Both are high-temperature resistant materials, silica and magnesium oxide react to form forsterite, magnesium oxide reacts with alumina micropowder to form spinel, carbon nanotubes can absorb substances in the castable to provide mechanical strength for the castable, sharp The joint effect of spar, carbon nanotubes, silica fume and phenolic resin can overcome the slow hardening speed of refractory castables, long demoulding time, low drying strength, and the composite refractory castables seep out of the permeable holes in the castable housing cavity Finally, the construction personnel will smooth it, and finally form a layer of castable protective layer on the inner pipe wall of the steel pipe body, so that the temperature of the outer wall of the pipe (at room temperature) can be guaranteed to be lower than 50°C, which can effectively ensure the composite refractory castable The flue gas temperature in the submerged arc furnace flue gas vacuum insulation pipe of the material layer will not decrease. In addition, because the submerged arc furnace flue gas vacuum insulation pipe with the composite refractory castable layer is a steel structure, it is guaranteed that the insulation layer after construction is completed. During the operation, people can enter the pipeline to check and clean the dust without being stepped on and damaged. The service life of the insulation layer can reach more than ten years.

Description of drawings

Accompanying drawing 1 is a schematic cross-sectional structure diagram of a submerged arc furnace flue gas vacuum insulation pipe with a composite refractory castable layer in a preferred embodiment.

Accompanying drawing 2 is the schematic cross-sectional structure diagram of the main body of the steel pipe in the vacuum insulation pipe for flue gas of submerged arc furnace with composite refractory castable layer in Fig. 1 .

Accompanying drawing 3 is the structural schematic diagram of the main body of the steel pipe in the vacuum insulation pipe for flue gas of submerged arc furnace with composite refractory castable layer in Fig. 1 .

Accompanying drawing 4 is a structural schematic diagram of another angle of the main body of the steel pipe in the vacuum insulation pipe for flue gas of submerged arc furnace with composite refractory castable layer in Fig. 1 .

In the figure: submerged arc furnace flue gas vacuum insulation pipe 10 with composite refractory castable layer, steel pipe main body 11, pipe wall 110, inner pipe wall 1100, first refractory castable injection hole 1101, second refractory castable injection hole 1102 , heat insulating glue injection hole 1103, vacuum chamber 111, annular embedding groove 112, outer wall 1120, annular embedding arm 113, outer wall 1130, heat insulating glue containing annular groove 114, heat insulating glue containing annular groove 115, castable chamber Body 120, isolation arm 130, isolation arm 140, aluminum silicate layer 32, barbed wire 33, asbestos board 34, ceramic fiber layer 35, first V-shaped screw nail 360, second V-shaped screw nail 361, composite refractory casting Material 600, composite refractory castable layer 601.

Detailed ways

Please refer to Figures 1 to 4, the submerged arc furnace flue gas vacuum insulation pipe 10 with a composite refractory castable layer includes a steel pipe body 11, and a vacuum chamber 111 and a castable material receiving chamber are arranged in the pipe wall 110 of the steel pipe body 11 body 120, the shape of the vacuum cavity 111 and the casting material storage cavity 120 corresponds to the shape of the steel pipe main body 11, the vacuum cavity 111 and the casting material storage cavity 120 are coaxial, and the casting material storage cavity 120 is connected to the steel pipe main body 11 The distance from the inner pipe wall 1100 of the steel pipe body 11 is smaller than the distance from the vacuum cavity 111 to the inner pipe wall 1100 of the steel pipe main body 11, and the first refractory castable injection hole 1101 and the second refractory castable injection hole are provided on the pipe wall 110 of the steel pipe main body 11 1102, the first refractory castable injection hole 1101 and the second refractory castable injection hole 1102 communicate with the castable storage cavity 120, and the inner pipe wall 1100 of the steel pipe main body 11 is provided with a permeable hole 121, and the permeable hole 121 is connected with the castable. The cavities 120 communicate. Through the first refractory castable injection hole 1101 and the second refractory castable injection hole 1102, the composite refractory castable 600 is filled into the castable storage cavity 120 with water and stirred evenly. The composite refractory castable 600 includes the following parts by weight Made of several components: 10~15 parts of corundum, 10~15 parts of mullite, 10~15 parts of silicon carbide, 5~10 parts of silica fume, 15~20 parts of magnesia, 10~15 parts of graphite, 10 parts of alumina micropowder ~15 parts, 2~10 parts of phenolic resin, 3~10 parts of carbon nanotubes; magnesia, graphite, corundum, mullite, silicon carbide are mixed to make granules and fine powder, alumina micropowder, silica fume, carbon nano Tube, phenolic resin as admixture, wherein, the parts by weight of granule and fine powder are: 50~55 parts of granule, 45~50 parts of fine powder, the particle size range is 1.2~1.6mm, and the particle size of fine powder is 0.4~ 0.8 mm, the composite refractory castable 600 is extruded and seeps out from the permeation hole 121 to form a composite refractory castable layer 601 .

One end of the pipe wall 110 of the steel pipe main body 11 is provided with an annular embedding groove 112, and the other end of the pipe wall 110 of the steel pipe main body 11 is provided with an annular embedding arm 113, the outer diameter of the annular embedding arm 113 corresponds to the inner diameter of the annular embedding groove 112, The thickness of the annular embedding arm 113 corresponds to the width of the annular embedding groove 112 . In this way, two submerged arc furnace flue gas vacuum insulation pipes 10 with composite refractory castable layers can pass through respective annular embedding grooves 112 and annular embedding arms 113 .

Wherein, the first refractory castable injection hole 1101 passes through the isolation arm 130 between the vacuum cavity 111 and the annular embedding groove 112, and communicates with the castable housing cavity 120; the second refractory castable injection hole 1102 passes through the vacuum cavity The isolation arm 140 between the body 111 and the annular embedded arm 113 communicates with the refractory housing cavity 120 .

Further, the outer wall 1130 of the annular embedding arm 113 is provided with an annular groove 114 for accommodating heat insulating glue, the outer wall 1120 of the annular embedding groove 112 is provided with an annular groove for accommodating heat insulating glue 115 , and the pipe wall 110 of the steel pipe main body 11 is provided with a spacer The hot glue injection hole 1103 , the heat insulation glue injection hole 1103 communicates with the heat insulation glue receiving annular groove 115 on the outer wall 1120 of the annular embedding groove 112 .

In the submerged arc furnace flue gas vacuum insulation pipe 10 with a composite refractory castable layer, a vacuum chamber 111 is arranged in the pipe wall 110 of the steel pipe body 11, and the shape of the vacuum chamber 111 corresponds to the shape of the steel pipe body 11, and has The submerged arc furnace flue gas vacuum insulation pipe 10 of the composite refractory castable layer is provided with a castable storage cavity 120, and in the composite refractory castable 600 in the castable storage cavity 120, magnesia is at high temperature to obtain magnesium oxide, di Silicon oxide, calcium oxide, magnesium oxide, and silicon dioxide are all high-temperature-resistant materials. Silicon dioxide reacts with magnesium oxide to form forsterite, magnesium oxide reacts with alumina micropowder to form spinel, and carbon nanotubes can absorb and cast The substances in the material provide mechanical strength for the castable. The joint action of spinel, carbon nanotubes, silica fume and phenolic resin can overcome the slow hardening speed of refractory castables, long demoulding time, low drying strength, and composite refractory castables. After oozing out from the permeable holes of the castable storage cavity, the construction personnel smoothed it out, and finally formed a protective layer of castable on the inner wall of the steel pipe body, so as to ensure the temperature of the outer wall of the pipe (under normal temperature) lower than 50°C, it can effectively ensure that the flue gas temperature in the submerged arc furnace flue gas vacuum insulation pipe 10 with the composite refractory castable layer will not decrease. The pipe 10 is a steel structure, which ensures that people can enter the pipeline to check and clean the dust during operation of the insulation layer after construction, without being trampled and damaged, and the service life of the insulation layer reaches more than ten years.

The above is only a preferred embodiment of the present invention, and should not limit the scope of the present invention, that is, all simple equivalent changes and modifications made according to the patent scope of the present invention and the description of the invention are all Still belong to the scope that the patent of the present invention covers.

Claims (1)

1. one kind has the mineral heating furnace flue vacuum heat-preserving tube of composite castable refractory layer, comprise steel pipe main body, it is characterized in that: in the tube wall of steel pipe main body, be provided with vacuum cavity and castable collecting cavity, vacuum cavity, the shape of castable collecting cavity is corresponding with the shape of steel pipe main body, vacuum cavity, castable collecting cavity is coaxial, and castable collecting cavity is less than the distance of vacuum cavity to the inner tubal wall of steel pipe main body to the distance of the inner tubal wall of steel pipe main body, the tube wall of steel pipe main body is provided with the first castable refractory hand-hole and the second castable refractory hand-hole, first castable refractory hand-hole and the second castable refractory hand-hole are accommodated cavity with castable and are communicated with, one end of the tube wall of steel pipe main body is provided with annular embedded groove, the other end of the tube wall of steel pipe main body is provided with annular and embeds arm, the external diameter that annular embeds arm is corresponding with the internal diameter of annular embedded groove, the thickness that annular embeds arm is corresponding with the width of annular embedded groove, be filled with in castable collecting cavity in castable collecting cavity to be filled with in castable collecting cavity and be filled with the composite castable refractory after stirring that adds water, composite castable refractory comprises following parts by weight component and makes: 10 ~ 15 parts, corundum, mullite 10 ~ 15 parts, 10 ~ 15 parts, silicon carbide, silicon ash 5 ~ 10 parts, 15 ~ 20 parts, magnesia, 10 ~ 15 parts, graphite, alumina powder 10 ~ 15 parts, 2 ~ 10 parts, phenolic resin, carbon nano-tube 3 ~ 10 parts, particle and fine powder is made after the mixing of magnesia, graphite, corundum, mullite, silicon carbide, alumina powder, silicon ash, carbon nano-tube, phenolic resin are as admixture, wherein, the parts by weight of particle and fine powder are: particle 50 ~ 55 parts, fine powder 45 ~ 50 parts, particle size range is 1.2 ~ 1.6mm, fine powder particle diameter is 0.4 ~ 0.8mm, the inner tubal wall of steel pipe main body offers permeability hole, permeability hole and castable are accommodated cavity and are communicated with, and composite castable refractory like this oozes out from permeability hole and forms composite castable refractory layer, the outer wall of annular embedding arm is provided with adiabatic gum collecting circular groove, the outer side wall of annular embedded groove is arranged adiabatic gum collecting circular groove, the tube wall of steel pipe main body is provided with adiabatic gum hand-hole, adiabatic gum hand-hole is accommodated circular groove with the adiabatic gum on the outer side wall of annular embedded groove and is communicated with, first castable refractory hand-hole is through after the isolation arm vacuum cavity and annular embedded groove, accommodate cavity with castable to be communicated with, the second castable refractory hand-hole is communicated with through accommodating cavity with castable after vacuum cavity and the annular isolation arm embedded arm.